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The income statement for the year 2018 of Sheffield Co. contains the following information: Revenues $70200 Expenses: Salaries and Wages Expense $45100 Rent Expense 12000 Advertising Expense 9700 Supplies Expense 5400 Utilities Expense 2500 Insurance Expense 2100 Total expenses 76800 Net income (loss) $ (6600) After the revenue and expense accounts have been closed, the balance in Income Summary will be ' a credit balance of $6600. ' a debit balance of $6600. \\" a credit balance of $70200. ' $0